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Table of Contents
doi:10.2204/iodp.sp.304305.2004
Table T2. Operations summary and time estimates for Expedition 305.
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Ponta Delgada, Azores
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Sea voyage from Ponta Delgada to Site AMFW-01A, 936 nmi @ 10.5 kt
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3.7
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AMFW-01A
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30.170°N,
42.123°W
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1630
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Hole A: Bare rock spud, RCB 4.5 m cores 0130 mbsf (3.1 days)
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Drop bit, log: triple combo, FMS/sonic, UBI (1.2 days)
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Hole B: HRRS hammer drill-in 22 m of 133/8 inch casing (1.9 days)
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Underream 143/4 inch hole with bicenter bit to ~130 mbsf (3.1 days)
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Run 120 m of 103/4 inch casing with MM and underreamer (1.7 days)
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Set retainer, cement 103/4 inch casing (0.9 days)
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Clean out cement, RCB 4.5 m cores 130250 mbsf
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4.2
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RCB 4.5 m cores 250370 mbsf
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4.1
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RCB 4.5 m cores 370490 mbsf
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3.8
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RCB 4.5 m cores 490610 mbsf
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4.3
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RCB 4.5 m cores 610730 mbsf
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4.4
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RCB 4.5 m cores 730850 mbsf
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4.4
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RCB 4.5 m cores 850970 mbsf
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4.5
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RCB 4.5 m cores 9701090 mbsf
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4.7
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RCB 4.5 m cores 10901100 mbsf
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1.6
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Log: triple combo, FMS/sonic, magnetometer, UBI
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2.5
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Vertical seismic profile Subtotal = 36.0 days
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0.5
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Hole B: RCB 4.5 m cores 0 to ~26 mbsf Subtotal = 1.6 days
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1.6
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Ponta Delgada, Azores
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Sea voyage from Site AMFW-01A to Ponta Delgada, 936 nmi @ 10.5 kt
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3.7
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7.4
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37.6
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3.0
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AMFW-01A
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~30.17°N,
~42.12°W
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1630
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HRRS hammer drill-in 22 m of 133/8 inch casing
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1.9
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Underream 143/4 inch hole with bicenter bit to ~130 mbsf
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3.1
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Run 120 m of 103/4 inch casing with MM and underreamer
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1.7
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Run retainer, cement 103/4 inch casing
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0.9
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Clean out cement, RCB 130250 mbsf
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3.8
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RCB 250370 mbsf
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3.8
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RCB 370490 mbsf
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3.8
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RCB 490610 mbsf
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3.9
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RCB 610730 mbsf
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4.0
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RCB 730850 mbsf Subtotal = 31.0 days
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4.1
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Drop bit; log: triple combo, FMS/sonic, magnetometer, UBI
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2.5
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Vertical seismic profile Subtotal = 3.0 days
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0.5
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Footwall
peridotite
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~30.17°N,
~42.12°W
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1630
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RCB to bit destruction
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35
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Footwall
peridotite
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~30.17°N,
~42.12°W
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1630
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MDCB core 4.5 mbsf
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1.8
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AMHW-01A
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~30.19°N,
~42.07°W
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2580
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RAB to bit destruction
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3.0
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See additional alternate sites in Table T1.
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Note: RCB = rotary core barrel, FMS = Formation MicroScanner, UBI = ultrasonic borehole imager, HRRS = hard rock reentry system, MM = mud motor, MDCB = motor-driven core barrel, RAB = resistivity at the bit.
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